work: added important work programs

wiki/work.md

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+# Work
+
+Work is a human activity that supports the needs of the wider community.
+It generally is viewed as contributing towards goods or services in an economy.
+
+## Programs
+
+There are various programs that can be useful in a work setting.
+The following are program types that are generally considered useful.
+
+- Office suites are an assortment programs that are similar to Microsofts Office suite.
+  - The original office programs are Microsofts Excel, Word, Powerpoint and more for
+    [Windows](/wiki/windows.md)
+  - [Apaches OpenOffice](https://www.openoffice.org/) is an open-source office suite for Windows
+    and [Linux](/wiki/linux.md).
+  - [LibreOffice](https://libreoffice.org/) is a free and open-source office suite for Windows and
+    Linux-based systems.
+- Time-tracking software includes programs that allow its user to track the time they spent working
+  on a specific task or project.
+  - [Watson](https://tailordev.github.io/Watson/) is a free and open-source time-tracker that uses
+    the [command-line interface](/wiki/linux/shell.md).
+    It is designed for Linux-based systems.